This folder contains correspondence and other documents relating to mines and ores to be bought, sold, worked, or tested. Some of the items deal with the mining interests of individuals who either wanted to sell property to Edison or to have their ores tested. There are also numerous inquiries regarding Edison's ore separation process.

Approximately 50 percent of the documents have been selected. The following categories of documents have not been selected: routine requests for Edison to test ore samples; routine offers of mining properties and ores for sale to Edison; correspondence and reports by Samuel G. Burn regarding his ore survey work for Edison in Virginia and North Carolina; bills and receipts; duplicate copies of selected documents.

Related documents can be found in D-89-01 (Battery) and D-89-70 (West Orange Laboratory - Suppliers).